Calendar chronometer



Jan. 9, 1951 L. FRANK CALENDAR CHRONOMETER 2 Sheets-$heet 2 Filed Jan.10, 1945 I INIL'NTOR. Lou/5 F'RHNK Jan. 9, 1951 1.. FRANK CALENDARCHRONOM ETER 2 Sheets-Sheet 1 Filed Jan. 10, 1945 INVENTOR. L o u/s F12a N/\ Patented Jan. 9, 1951 UNITED STATES FATENT OFFICE].

CALENDAR CHRON'OMETER;

Louis Frank, Fellows..alif.

Application January 10, 1945, Serial. No. 572,130

. 4 Claims.

t My invention relates generally to chronometers such as theconventional forms of clocks and watches, and more particularlyto anattachment which may be readily combined with practically all clockandwatch movements and operated thereby, for indicating the names of themonths, the numbers of the days thereof and. the names of the days of'the week, thus in effect, providing in the onestructur'e a combinedclock and calend'ar.

I One of the principal objects of my invention is, to provide a;calendar attachment ofthecharacter referred to which is'simple instructure, inexpensive of manufacture and which is very compact sothatnoadditional space is requiredfor its installation; inasmuch aspractically all forms "of-clocks and watches now manufactured, haveample space between the dial and movement,

for-the-re'cepti'on of thecalendar mechanism. .a

A further'object of my invention is, to provide simple; practical andconvenient means for manually actuating and setting the calendarattachment, so as to compensate for those-months having" twenty-eightand twenty-nine or thirty days.

My invention also embodies other and more detailed objects andadvantages which will become more apparent as the disclosure proceeds;

In the accompanying drawings, wherein similar reference charactersdesignate corresponding parts throughout the several views:

Fig. 1 is? a front e'levational view of a calendar clock embodyingrnyinvention.

Fig. 2" is a' vertical section taken through the front portion of theclock. just behind the dial and showing the calendar attachment in frontelevation- Fig. 3 is a horizontal section taken on the line 3-3 of Fig.2.

Fig. 4 is a perspective view of the parts of the calendar attachment insegregated disposition.

Fig. 5 is a detail section taken on the line 55 of Fig. 2.

Fig. 6 is a detail section taken on the line t6 of Fig. 2.

Fig. '7 is a detail section taken on the line 1-1 of Fig. 2.

Fig. 8 is a vertical section taken on the line 8-8 of Fig. 2.

Fig. 9 is an elevational view taken looking in the direction of thearrow9 in Fig. 8.

Referring by numerals to the accompanying drawings, which illustrate apreferred embodiment of my invention, l0 designates the housing of aconventional clock (or watch) II the hour wheel, i2 the'hourhand and t3the minute hand. A- Geneva wheel 54 having eight equally spaced notches,[5 is mounted for rotation on a stud Hi to the side of the hour wheel Hand projecting from the face of said wheel it, are four equally spacedpins H. A pin i t projects from the face of hour wheel H andsuccessively engages in notches" 15, thus intermittently'rotating theGeneva wheel M. Formed in the face of Geneva wheel M areeight equallyspaced recesses l8, which are adapted to successively receive a stud IS, pressed inwardly from a resilient finger 20, that is mounted on studIt, thus providing a spring detent for'said wheel M.

Sealed in the frame of the clock' movement below the hour-wheel is astud 2|, onwhich is mounted a ratchet wheel 22, having thirty-one teethand formed in the face of this wheel directly opposite said teeth areshallow depressions 23. Appearing on the face of this wheel 22 directlyopposite and adjacent the teeth thereof are the numerals; from i. to 31inclusive. Projecting from the face of the wheel 22' adjacent thetoothed edge thereof is a pin 24. Mounted on stud 2| is an arm 25 andprojecting from the end thereof adjacent said teeth. are divergingfingers 26 and 2?.

J ournalled on. a stud 28'which is seated in the end of finger 26'; is aratchet wheel 29, having seven teeth, one foreach day of. the week' andthe face of said wheel adjacentthe teeth thereof, bearing the names orabbreviations of the names offt e dayofthe week".v

The teeth of wheel Z'Qtravel in a. circular path adjacent thepath'traveled by the teeth of ratchet wheel 22, and thus the. teeth of bothwheels 22 and 29 are engaged and intermittentl rotated by pins I! ofGeneva wheel M.

An L-shaped resilient member 38 is secured to stud 2i and one of thearms of said member has an inwardly pressed stud 3 i, which passesthrough an aperture 32 in arm 26 and engages successively in recesses 33that are formed in the face of wheel 29 adjacent the teeth thereof, thusin efiect providing a spring ,detent for said wheel (see Fig. 6).

The other arm of resilient member is pivoted with a stud 34 which passesthrough an aperture 35 in arm 2! and engages successively in therecesses 23 in wheel 22, thus providing a spring detent for said wheel.(See Fig. '7.)

Journalled on a stud 36 seated in the end of arm 25 opposite the fingers26 and 21, is a ratchet wheel 3! having twelve teeth, one for each monthand the face of bearing the names of the months the month wheel 22.

and being provided with twelve depressions 38. A flat spring 9, securedat M to arm 25 and its other end having a stud 42, which passes throughan aperture 43 in said arm and engages in the recesses 23, provides aspring detent for the month wheel 31.

The manually operable means for rotating the wheel 22 to compensate forthe different number of days of different months, is illustrated inFigs. 8 and 9 and such means includes an arm 44, journalled on stud 2!,and the free end of said arm, carrying a spring pressed detent 45 whichengages the teeth of ratchet wheel 22.

The arm is pushed upwardly to move wheel 22 the distance of one tooth,by a spring held plunger 46, operating through the bottom of case orhousing lfl. (See Fig. 3.) As hour wheel H rotates pin H andsuccessively engages in the notches l of the Geneva wheel 14 and pins I!of said Geneva wheel intermittently engage the teeth of the week daywheel 29 and day of Two complete revolutions of the hour wheel arerequired to move week day wheel 29, one tooth, or one-seventh of acomplete revolution and the day of the month wheel 22 one tooth, or onethirty-first of a complete revolution, for the reason that the Genevawheel has eight notches l5 and four pins 11 and thus there is a hiatusor t me interval equal to one notch between the engagements of the pinsI I with the teeth of wheels 22 and 29.

Once every revolution of wheel 22, pin 24 engages and rotates wheel 31the distance of one notch or one twelfth of a revolution. Thus in everythirty-one days the hour wheel H makes sixty-two complete revolutions toone revolution of the day of the month wheel 22, seven and three-fourthsrevolutions of the Geneva wheel, four and three-sevenths of a revolutionof the days of the week wheel 29, and one-twelfth of a revolution of themonth wheel 31.

Tooth H engages one of the teeth of wheel 22 and moves same the requireddistance before it engages the tooth of wheel 29 and moves same theproper d stance (one tooth). In other words, pin I1 moves wheel 29, oneseventh of a complete rotation and wheel 22, one thirty-first of acomplete rotation.

As seen in Fig. 1, portions of the dial of the clock or watch are cutaway to form windows W through which the markings on the wheels 29, 22and 31 may be readily observed.

Thus it will be seen that I have provided a calendar attachment forclocks, watches and the like, which is simple in structure, inexpensiveof manufacture and very effective in performing thefunctionsfor which itis intended.

It will be understood that minor changes in the size, form andconstruction of the various parts of my improved chrono-meter attachmentmay be made and substituted for those herein shown and described withoutdeparting from the spirit of my invention, the scope of which is setforth in the appended claims.

I claim as my invention:

1. The combination with a chronometer including a frame and an hourwheel, journalled thereon, which hour wheel has a pin projecting fromits face, of a calendar mechanism including a Geneva wheel journalled onsaid frame,

and provided with a series of notches which successively receive the pinofthe hour wheel, a bracket mounted on said frame below said hour andGeneva wheels, a week day indicating ratchet wheel journalled on saidbracket, the toothed edge of which overlies the edge of the Genevawheel, a day of the month indicating ratchet wheel, journalled on saidbracket, the edge of which day of the month indicating ratchet wheellies between the overlapping edges of said Geneva wheel and said weekday indicating wheel and pins projecting from the face of said Genevawheel for simultaneously engaging teeth of said day of the week and dayof the month wheels, to move same the distance of one tooth each.

2. The combination as set forth in claim 1, with a month indicatingratchet wheel journalled on said bracket and a pin projecting from theface of said day of the month wheel for engaging the teeth of said monthindicating wheel and rotating same the distance of one tooth at a time.

3. The combination as set forth in claim 1, with manually operable meansmounted on-said bracket for imparting step by step movement to said dayof the month ratchet wheel.

4. The combination as set forth in claim 1, with detent means mounted onsaid bracket for holding said week day ratchet wheel and said day of themonth wheel at predetermined points in their rotation.

LOUIS FRANK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS u Number Name Date 412,796 Rosenburg Oct. 15, 18891,234,829 Trane July 31,..1917 2,123,091 Becker July 5, 1938 FOREIGNPATENTS Number Country Date 430,109 Great Britain June 13, 1935

